Generate handy classes to make easy spacing (padding and margin)

4 configurable sizes :

$dim-xs: 10px!default; // very small
$dim-sm: 15px!default; // small
$dim-md: 30px!default; // medium
$dim-lg: 45px!default; // large

m-lg class add a big margin on four sizes p-xs class add a small padding on four sizes

t: top b: bottom l: left r: right

m-r-lg add a large margin (45 pixel at its right)

Code released under the MIT License.